Physics Help Forum Quick Circuit Question, Direction of Flow
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 Jul 14th 2011, 03:37 PM #1 Junior Member   Join Date: Jul 2011 Posts: 1 Quick Circuit Question, Direction of Flow Hi all, I've got a quick question about current flow in a circuit. Our prof told us that current flows out of the positive end of the battery, but he didn't tell us how it works in a circuit with 2 batteries. I couldn't figure it out from the text, either, and I haven't found the answer online. Here's the problem in question: http://i.imgur.com/EbU3I.png. You can see pencil-smears from where I was trying to determine the flow. I know that current is flowing from the positive end of the 12-Volt, because I solved for Amps through the 3.9-Ohm resistor and the back of the book said my answer was right (the problem does not mention direction, and was asking for the Amps at each resistor). Using the same logic for the 9-Volt, however, got me the wrong Amperage for the 6.7-Ohm resistor (book says it should be 1.0A). How can I figure out current flow without looking in the back of the book?